Which asteroid was the only one discovered by Edwin Hubble?

The only asteroid discovered by Edwin Hubble was 1373 Cincinnati. He found it on August 30, 1935, while observing from Mount Wilson Observatory in California.

The discovery was somewhat incidental to Hubble’s main work on distant galaxies. Cincinnati is an outer-main-belt object in the Cybele region, with an orbit reaching roughly 2.3 to 4.5 astronomical units from the Sun. Its unusual orbit gives it a comet-like dynamical classification, although it is an asteroid rather than a comet.

The number is easy to confuse with other astronomy references: 2069 Hubble is another asteroid named in his honor, but Hubble did not discover it. 433 Eros and 951 Gaspra are also notable asteroids, yet neither is connected to Hubble’s sole asteroid discovery. Cincinnati was named for the Cincinnati Observatory, whose staff helped calculate its orbit; the name became official in 1962.